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* stm32f1: Remove now unused src/stm32f1/ directoryKevin O'Connor2019-08-051-148/+0
| | | | | | | Now that the stm32f1 code has been merged into the stm32 code, there is no longer a need to keep the stm32f1/ directory. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* armcm_timer: Unify udelay() implementationKevin O'Connor2019-06-091-14/+0
| | | | | | | Move the udelay() code from various arm board directories into the src/generic/armcm_timer.c code. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* command: Always pass a string to the DECL_CONSTANT() macroKevin O'Connor2019-03-171-1/+1
| | | | | | | | Make it clear that the name of the constant being defined is a string. When the value being defined is also a string, use a new DECL_CONSTANT_STR() macro. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* stm32f1: Use internal functions for early USB gpio toggleKevin O'Connor2019-02-061-0/+17
| | | | | | | Avoid using the "low-level" library timing utilities. This is in preparation for using SysTick as part of the timer implementation. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* stm32f1: It's only necessary to program the CR1 register during SPI initKevin O'Connor2019-01-071-2/+0
| | | | | | Only set the CR1 register during spi_prepare(). Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* stm32f1: Add support for building with bootloader supportKevin O'Connor2018-10-111-0/+2
| | | | Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* stm32f1: add SPI supportGrigori Goronzy2018-07-071-0/+9
| | | | | | | | | Add basic SPI support and associated documentation. v2: remove baud rate check, fix baud rate calculations v3: finish transaction with BSY check, disable SPI when not in use Signed-off-by: Grigori Goronzy <greg@chown.ath.cx>
* Add STM32F103 portGrigori Goronzy2018-04-091-0/+136
Add a fully functional STM32F1 port, currently mostly targeting STM32F103 microcontrollers. This requires an 8 MHz XTAL. The maximum possible step rate is around 282K steps per second. This uses stm32flash to burn the firmware. The bootloader needs to be started by setting BOOT0 to 1 and resetting the MCU. There is no automatic bootloader, unlike on Arduino. Signed-off-by: Grigori Goronzy <greg@kinoho.net>
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